They are insanely long but if you have a couple of hours to kill while doing other shit, the Giant Bomb Live Nites at E3 are absolutely fantastic to watch, just hours of devs and insiders hanging out and bullshitting with Jeff, last nights panel with the chick from Star Wars battlefront was pretty interesting - OMG she is hotter than a thousand suns but her personality is annoying as fuck
whole night 1:
just the second panel:
night 2 is live right now and will probably go on for another 2-3 hours